Repost if you enjoy hard sci-fi whilst also feeling that enjoying hard sci-fi is a big red flag for personality Also name a good hard sci-fi series

Hyperion, by Dan Simmons. (Then read The Fall Of Hyperion. I would not recommend the other sequels.) Gateway, by Frederick Pohl. (Do not read the sequels, period.) Kim Stanley Robinson's "Mars" series. (h/t @tungol.bsky.social )